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The structure, mobility, and properties of crosslinked starch materials of various compositions were investigated with FTIR and NMR spectroscopy, and relaxation time measurements were taken with… Continue Reading
Spiro[pyrrole-3,2′-3(2H)-benzofuranones] 7 have been synthesized by [4+2] cycloaddition of 2-arylidene-3(2H)-benzofuranones with the 2-benzoyl-1,2-dihydroisoquinoline-1-carbonitrile… Continue Reading
Abstract A general synthesis of derivatives of 1,2,4-triphenyl-4,10-dihydro-10-thia-3,4-diazaphenanthrene (a new heterocyclic skeleton) in two steps from 3-arylidene-4-isothiochromanones via… Continue Reading
Three azomethine ylide precursors including the methyl 3,4-dihydro-6,7-dimethoxyisoquinoline-3carboxylate moiety were synthesized. The 1,3-dipolar species formed from these products react with acti...
Abstract The PMR spectroscopic properties (250 MHz) for cycloadducts of diphenylnitrilimine towards 1,2-dihydronaphthalenes substituted at the C 1 -carbon atom have been studied. The data allow us to… Continue Reading
Cristallisation dans le systeme triclinique, groupe P1 et affinement jusqu'a R=0,053. Le cycle pyrazolique est forme par cycloaddition dipolaire 1,3 regioselective
Abstract Mass spectrometry study of N -methyl 2H,3,4-dihydro 1,3-benzoxazines exhibits a retro-Diels—Alder fragmentation pathway. This reaction mainly leads to the dienic ion which is stabilized by… Continue Reading